William p



duidt %tua aan eine,

WLLIAM P. HHARWOOD, OF CAMBRIDGE, NEW YORK, ASSGNOR TO JAMES F. HALL ANDJOHN L. MARSHALL, OF SAME PLACE.

Letters Patent No. 113,656, dated April 11, 1871.

MPROVEMENT iN VISES.

'The Schedule referred to in these Lettere Patent and making part of thesame.

To all whom it may concern Be it known that I, WILLIAM E. Hnawoon, ofambridge, in the county'of Washington and State of New York, haveinvented a new and useful Improvement in Bench-Vise; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, which will enable others skilled in the art to make and use thesame, reference being had to the parts.

This invention relates to an improved construction of vise for holdingtapering articles; and

It consists in forming a recess or semi-cylindrical groove across theface of each jaw of the vise and in iitting therein a movable piecewhich is of the form of a longitudinal half section of a solid cylinder,the same being provided with slotted ears to adapt it to be heldsecurely in place by means of pins projecting from each end of the jaw,as hereinafter described.

Hitherto the construction of visos of' this class has been objectionablein view of the fact that the movable piece hasbeen so connected with thejaws of the. same as to allow chips and iilings to fall into oraccumulate in the space or wedge-like cavity on the upper side ofthejaws; hence, interruption ofthe operation ofthe vise and ineiciency ofthe saine for its intended function have resulted. l' remedy theseobjections and also increase the strength, while lessening the cost ofthe vise, by the construction hereinafter set forth.

In the drawing- A indicates the frontjaw of the vise.,

B, a screw for moving the same, and which is swiveled in the not I)attached to the block E.

he arno O is formed solid with the jaw A., and extends through a squarehole in the block E. On the upper side of this block is formed a seat toreceive the baee-plate of the rear jaw F.

Similar letters of reference indicate corresponding The rear edge of thebase-plate ofthe jaw F is curved upon the arc of a'circle, 'and has afrange formed upon it which enters a recess or groove formed in the topof the block E, and thus serves as a guida,

support, a-nd brace to the jaw F.

Upon the lower end of the jaw F is formed a semicylindrical projection,provided with a flange upon its lower end, which enters and ts into arecess formed upon the forward side of the upper part of the block E,and which pivots the jaw F to the block E so that the jaw F may turnhorizontally to adjust itself to a tapering article to be heldhorizontally.

The jaw F is secured iu a position parallel with the jaw A by a pin, G,passing through a hole in the base-plate of the said jaw F and into'ahole inthe block E.

ln the face of one of the jaws, as F, is formed a semi-cylindricalrecess` in which is placed a semi cylindrical piece, H, to the ends ofwhich are attached or upon them are formed plates or flanges, whichenter and work in recesses formed in theends of the jaw F.

The movements ofthe piece H are limited and guided by pins orprojections attached to or formed upon the ends of the jaw F, and whichenter curved slots in the flanges or plates h', as shown in tig. 1. Bythis means the piece H can adjust' itself to the taper of an article tobe held vertically. The piece-H will also adjust itseli to hold articleswith parallel sides, holding themas tirmly as a vise with solid jawswould hold them.

It will be observed that the semi-cylindrical piece H is so nicelyfitted in the recess of the jaws (as properly illustrated in g. 2) thatif chips, filings, &c., fall'

